Man I tried to post here ages ago. I can’t believe no one has replied
That’s a plugin for wordpress I use. Will work in the forum.
Embedly used to help for SoundCloud but I recently had to deactivate it as I believe a recent version of WordPress now directly supports URLs to soundcloud.com
I’m using WordPress 3.7 and bbPress 2.4.x and there appears to be no problem dropping the soundcloud URL on a line by itself.